Answer:

Step-by-step explanation:
As in the question given that, ∠AOB and ∠COB are linear pair and being theses angles are supplements it will form 180°. Hence, option A is the correct ✔️
Answer:

multiply numerator and denominator with same numbers. Resulting fractions are equivalent.
The answer is d)3 because each number gets multiplied by 3 to qual the next number